Effect of Bolt Corrosion on Bending Behavior of Segmental
Joints of Shield Tunnel

doi:10.3973/j.issn.2096-4498.2020.S2.009

Tunnel Construction ›› 2020, Vol. 40 ›› Issue (S2): 67-75.DOI: 10.3973/j.issn.2096-4498.2020.S2.009

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Effect of Bolt Corrosion on Bending Behavior of Segmental Joints of Shield Tunnel

LI Baojun¹, ZHONG Yi¹, ZHANG Dongmei^{2, 3}

(1. Shenzhen Transportation Public Facilities Construction Center, Shenzhen 518041, Guangdong, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)

Online:2020-12-31 Published:2021-03-21

Abstract

Abstract: The effect of bolt corrosion on the mechanical behavior of the ultimate bearing capacity and bending stiffness of segmental joints of shield tunnel is analyzed using numerical simulation method and considering different load types and eccentric distances. The analytical results are compared with model test data. The comparison results show that (1) the joint bending of concrete at compressed area and when bolt yields after bolt corrosion decreases, and the structural elastic limit decreases. (2) In elastic stage, the corrosion of the longitudinal joint bolts has no influence on the mechanical behavior of the structure; but in plastic stage, the deformation of the joint increases and the joint bending stiffness decreases with the corrosion of the longitudinal joint bolts. (3) The ultimate bearing capacity of the longitudinal joint decreases due to the corrosion of the longitudinal joint bolts, and the degradation degree of the ultimate bearing capacity is positively related to bolt corrosion degree, while the the corrosion range has no effect. The corrosion of the longitudinal joint bolts also changes the failure form of the longitudinal joint in the negative bending moment condition.

Key words: shield tunnel, joint bending behavior, numerical simulation, bolt corrosion, ultimate bearing capacity

CLC Number:

U 459.3

LI Baojun, ZHONG Yi, ZHANG Dongmei.

Effect of Bolt Corrosion on Bending Behavior of Segmental Joints of Shield Tunnel [J]. Tunnel Construction, 2020, 40(S2): 67-75.

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Effect of Bolt Corrosion on Bending Behavior of Segmental Joints of Shield Tunnel

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